2173776421 has 2 divisors, whose sum is σ = 2173776422. Its totient is φ = 2173776420.

The previous prime is 2173776361. The next prime is 2173776433. The reversal of 2173776421 is 1246773712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1891032196 + 282744225 = 43486^2 + 16815^2 .

It is a cyclic number.

It is not a de Polignac number, because 2173776421 - 2¹⁷ = 2173645349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2173776481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1086888210 + 1086888211.

It is an arithmetic number, because the mean of its divisors is an integer number (1086888211).

Almost surely, 2^2173776421 is an apocalyptic number.

It is an amenable number.

2173776421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2173776421 is an equidigital number, since it uses as much as digits as its factorization.

2173776421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 98784, while the sum is 40.

The square root of 2173776421 is about 46623.7752761400. The cubic root of 2173776421 is about 1295.4031771382.

The spelling of 2173776421 in words is "two billion, one hundred seventy-three million, seven hundred seventy-six thousand, four hundred twenty-one".